The Big Girtha fins were more of a Big Bertha shape.
The kit fins were used but needed a little more on the leading edge to match the shape of the original Girtha.
There was enough kit balsa to add to the leading edge.
A fourth fin was cut out.
The Big Bertha has four 1/8" thick fins, the Big Betty's three fins are 3/32" thick.
All four fins were pinned together and sanded to the same size on a block with 220 grit.
These fins will be covered with copy paper like my first Girtha.
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